/*
 * Copyright 2011 James Moger.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.iciql;

import com.iciql.TableDefinition.FieldDefinition;
import com.iciql.util.StatementBuilder;

/**
 * MySQL database dialect.
 */
public class SQLDialectMySQL extends SQLDialectDefault {

    @Override
    public String convertSqlType(String sqlType) {
        if (sqlType.equals("CLOB")) {
            return "TEXT";
        }
        return sqlType;
    }

    @Override
    protected <T> String prepareCreateTable(TableDefinition<T> def) {
        return "CREATE TABLE IF NOT EXISTS";
    }

    @Override
    public <T> void prepareDropView(SQLStatement stat, TableDefinition<T> def) {
        StatementBuilder buff = new StatementBuilder("DROP VIEW IF EXISTS "
                + prepareTableName(def.schemaName, def.tableName));
        stat.setSQL(buff.toString());
        return;
    }

    @Override
    public String prepareColumnName(String name) {
        return "`" + name + "`";
    }

    @Override
    protected boolean prepareColumnDefinition(StatementBuilder buff, String dataType, boolean isAutoIncrement,
                                              boolean isPrimaryKey) {
        String convertedType = convertSqlType(dataType);
        buff.append(convertedType);
        if (isIntegerType(dataType) && isAutoIncrement) {
            buff.append(" AUTO_INCREMENT");
        }
        return false;
    }

    @Override
    public <T> void prepareMerge(SQLStatement stat, String schemaName, String tableName,
                                 TableDefinition<T> def, Object obj) {
        StatementBuilder buff = new StatementBuilder("INSERT INTO ");
        buff.append(prepareTableName(schemaName, tableName)).append(" (");
        buff.resetCount();
        for (FieldDefinition field : def.fields) {
            buff.appendExceptFirst(", ");
            buff.append(field.columnName);
        }
        buff.resetCount();
        buff.append(") VALUES (");
        for (FieldDefinition field : def.fields) {
            buff.appendExceptFirst(", ");
            buff.append('?');
            Object value = def.getValue(obj, field);
            Object parameter = serialize(value, field.typeAdapter);
            stat.addParameter(parameter);
        }
        buff.append(") ON DUPLICATE KEY UPDATE ");
        buff.resetCount();
        for (FieldDefinition field : def.fields) {
            buff.appendExceptFirst(", ");
            buff.append(field.columnName);
            buff.append("=VALUES(");
            buff.append(field.columnName);
            buff.append(')');
        }
        stat.setSQL(buff.toString());
    }
}